Bug: create_react_agent doesn't actually take in a ToolExecutor

[mschoenb97IL]

In the type hints for create_react_agent, it says that tools can be passed in as a ToolExecutor, but in practice this does not work.

This script:

from typing import Literal

from langchain_openai import ChatOpenAI
from langgraph.prebuilt.tool_executor import ToolExecutor
from langchain_core.tools import tool
from langgraph.prebuilt import create_react_agent

openai_api_key = "sk-..."

model = ChatOpenAI(model="gpt-4o", temperature=0, api_key=openai_api_key)


@tool
def get_weather(city: Literal["nyc", "sf"]):
    """Use this to get weather information."""
    if city == "nyc":
        return "It might be cloudy in nyc"
    elif city == "sf":
        return "It's always sunny in sf"
    else:
        raise AssertionError("Unknown city")


# this works fine
tools = [get_weather]
# this does not
tools = ToolExecutor([get_weather])


# Define the graph


graph = create_react_agent(
    model,
    tools=tools,
)


def print_stream(stream):
    for s in stream:
        message = s["messages"][-1]
        if isinstance(message, tuple):
            print(message)
        else:
            message.pretty_print()


message = "What is the weather in SF and new york?"


inputs = {
    "messages": [
        ("user", message),
    ]
}
print_stream(graph.stream(inputs, stream_mode="values"))

Gives this error:

    graph = create_react_agent(
            ^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/sevin/lib/python3.12/site-packages/langgraph/_api/deprecation.py", line 54, in wrapper
    return func(*args, **kwargs)
           ^^^^^^^^^^^^^^^^^^^^^
  File "/opt/conda/envs/sevin/lib/python3.12/site-packages/langgraph/prebuilt/chat_agent_executor.py", line 611, in create_react_agent
    workflow.add_node("tools", ToolNode(tools))
                               ^^^^^^^^^^^^^^^
  File "/opt/conda/envs/sevin/lib/python3.12/site-packages/langgraph/prebuilt/tool_node.py", line 79, in __init__
    for tool_ in tools:
TypeError: 'ToolExecutor' object is not iterable

[mschoenb97IL]

Reported as a bug